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Check the box that says "use test and interval based on normal distribution".Ignore the test proportion (we'll use this in chapter 7).Make sure the confidence level is set correctly.This is NOT the percent of people that you found for part a, but you'll have to take that percent of the total sample size and round it to a whole number to enter here. The number of events is the number of successes, x, which represents the number of people who feel that the country is seriously off on the wrong track.The number of trials is the sample size, n, for the survey that you found for part b.Choose Stats / Basic Statistics / 1 Proportion.Read the Harris Poll® #16, February 16, 2006, at Confidence Interval Simulations (Question 5)ĭemonstrations page and choose the Confidence Interval Simulation from section 6.2.īe sure you explain how the confidence level relates to the process of finding a confidence interval. Go to the statisticalĭemonstrations page and choose the Sampling Distribution from section 5.5. You don't need Minitab or Statdisk for this question. Pick the appropriate set of instructions from above, but change the mean and the standard deviation to the appropriate values before continuing. This question is like questions 1 and 2 except we are no longer working with To the left and then enter that into the box. If the area is some other area, you have to figure out how much is.If the area you know is the area to the right, subtract it from one.If the area you know is the area to the left, enter it into the box.Make sure Inverse Cumulative Probability is checked.This uses the inverse cumulative probability, which gives you the z-score Why we do this will become more apparent in later chapters. Is found by taking the smaller of the two areas and multiplying it by two. To the right, subtract the area to the left from one. The value that Minitab returns will be the area to the left. Check Input constant and enter your z-score in the box.Make sure Cumulative Probability is checked.Choose Calc / Probability Distributions / Normal.This uses the cumulative probability distribution, which is the area to the Minitab ALWAYS returns the area to the left of a z-value. Minitab Instructions for Chapter 5 Technology Exercise Minitab Instructions for Chapter 5 Technology Exercise